Q0015 – Detailed explanation of the format of custom attributes in Android

Refer to the article

• Custom Attributes in Android (attrs. XML, use of TypedArray)

Android custom attribute format details

1. Reference: Reference a resource ID. (1) Attribute definition:<declare-styleable name = "Name">
                   <attr name = "background" format = "reference" />
            </declare-styleable>(2) Attribute use:<ImageView
                     android:layout_width = "42dip"
                     android:layout_height = "42dip"
                     android:background = "@ drawable/picture ID"
                     />2. color: color value. (1) Attribute definition:<declare-styleable name = "Name">
                   <attr name = "textColor" format = "color" />
            </declare-styleable>(2) Attribute use:<TextView
                     android:layout_width = "42dip"
                     android:layout_height = "42dip"
                     android:textColor = "#00FF00"
                     />3. Boolean: Indicates a Boolean value. (1) Attribute definition:<declare-styleable name = "Name">
                   <attr name = "focusable" format = "boolean" />
            </declare-styleable>(2) Attribute use:<Button
                    android:layout_width = "42dip"
                    android:layout_height = "42dip"
                    android:focusable = "true"
                    />B: Dimension. (1) Attribute definition:<declare-styleable name = "Name">
                   <attr name = "layout_width" format = "dimension" />
            </declare-styleable>(2) Attribute use:<Button
                    android:layout_width = "42dip"
                    android:layout_height = "42dip"
                    />5. Float: floating point value. (1) Attribute definition:<declare-styleable name = "AlphaAnimation">
                   <attr name = "fromAlpha" format = "float" />
                   <attr name = "toAlpha" format = "float" />
            </declare-styleable>(2) Attribute use:<alpha
                   android:fromAlpha = "1.0"
                   android:toAlpha = "0.7"
                   />6. Integer: indicates an integer value. (1) Attribute definition:<declare-styleable name = "AnimatedRotateDrawable">
                   <attr name = "visible" />
                   <attr name = "frameDuration" format="integer" />
                   <attr name = "framesCount" format="integer" />
                   <attr name = "pivotX" />
                   <attr name = "pivotY" />
                   <attr name = "drawable" />
            </declare-styleable>(2) Attribute use:<animated-rotate
                   xmlns:android = "http://schemas.android.com/apk/res/android" 
                   android:drawable = "@ drawable/picture ID" 
                   android:pivotX = "50%" 
                   android:pivotY = "50%" 
                   android:framesCount = "12" 
                   android:frameDuration = "100"
                   />7. String: indicates a string. (1) Attribute definition:<declare-styleable name = "MapView">
                   <attr name = "apiKey" format = "string" />
            </declare-styleable>(2) Attribute use:<com.google.android.maps.MapView
                    android:layout_width = "fill_parent"
                    android:layout_height = "fill_parent"
                    android:apiKey = "0jOkQ80oD1JL9C6HAja99uGXCRiS2CGjKO_bc_g"
                    />A fraction is a percentage. (1) Attribute definition:<declare-styleable name="RotateDrawable">
                   <attr name = "visible" />
                   <attr name = "fromDegrees" format = "float" />
                   <attr name = "toDegrees" format = "float" />
                   <attr name = "pivotX" format = "fraction" />
                   <attr name = "pivotY" format = "fraction" />
                   <attr name = "drawable" />
            </declare-styleable>(2) Attribute use:<rotate  xmlns:android = "http://schemas.android.com/apk/res/android"
　　             android:interpolator = "@ anim/animation ID"
                 android:fromDegrees = "0"
　　             android:toDegrees = "360"
                 android:pivotX = "200%"
                 android:pivotY = "300%"
　　             android:duration = "5000"
                 android:repeatMode = "restart"
                 android:repeatCount = "infinite"
                   />9. Enum: Enumeration value. (1) Attribute definition:<declare-styleable name="Name">
                   <attr name="orientation">
                          <enum name="horizontal" value="0" />
                          <enum name="vertical" value="1" />
                   </attr>           
            </declare-styleable>(2) Attribute use:<LinearLayout
                    xmlns:android = "http://schemas.android.com/apk/res/android"
                    android:orientation = "vertical"
                    android:layout_width = "fill_parent"
                    android:layout_height = "fill_parent"
                    >
            </LinearLayout>10. Flag: bit or operation. (1) Attribute definition:<declare-styleable name="Name">
                    <attr name="windowSoftInputMode">
                            <flag name = "stateUnspecified" value = "0" />
                            <flag name = "stateUnchanged" value = "1" />
                            <flag name = "stateHidden" value = "2" />
                            <flag name = "stateAlwaysHidden" value = "3" />
                            <flag name = "stateVisible" value = "4" />
                            <flag name = "stateAlwaysVisible" value = "5" />
                            <flag name = "adjustUnspecified" value = "0x00" />
                            <flag name = "adjustResize" value = "0x10" />
                            <flag name = "adjustPan" value = "0x20" />
                            <flag name = "adjustNothing" value = "0x30" />
                     </attr>        
             </declare-styleable>(2) Attribute use:<activity
                   android:name = ".StyleAndThemeActivity"
                   android:label = "@string/app_name"
                   android:windowSoftInputMode = "stateUnspecified | stateUnchanged　|　stateHidden">
                   <intent-filter>
                          <action android:name = "android.intent.action.MAIN" />
                          <category android:name = "android.intent.category.LAUNCHER" />
                   </intent-filter>

             </activity>Note: Multiple types of values can be specified when an attribute is defined. (1) Attribute definition:<declare-styleable name = "Name">
                   <attr name = "background" format = "reference|color" />
            </declare-styleable>(2) Attribute use:<ImageView
                     android:layout_width = "42dip"
                     android:layout_height = "42dip"
                     android:background = "@ drawable/picture ID | # 00 ff00"
                     />
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